Ellison’s HI2200/2300 series of high temperature pressure transducers with silicon-on-sapphire sensor technology offer levels of performance previously unobtainable at temperatures up to 200°C.
The advanced sensor design consists of a piezoresistive silicon strain gauge circuit grown onto the surface of a sapphire diaphragm to form a single crystalline structure. The sapphire sensor element is then bonded to a titanium alloy sub-diaphragm that enables it to endure high overpressures and provides excellent corrosion resistance. The structure exhibits virtually no hysteresis and the sapphire substrate protects the strain gauge circuit from radiation allowing the sensor to operate over a wide temperature range without loss of performance.
With pressure ranges from 0-1500 bar, the high temperature transducer is available in two options: model HI2200 offers an uncompensated signal output of between 10 mV/V and 20 mV/V, whilst model HI2300 is fully temperature compensated with a rationalised 10 mV/V signal output. All models are available with either PTFE cable outlet or military bayonet style plug, both of which are rated for use at 200°C. This means that not only does the transducer perform effectively at high media temperatures, but it can also be used in environments with elevated ambient temperatures up to 200°C, for instance inside an oven or furnace.
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